# -*- coding: utf-8 -*- 
# @project : 《剑指offer》
# @Author : created by bensonrachel on 2021/7/5
# @File : 二叉树的镜像.py

# Definition for a binary tree node.
# class TreeNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution(object):
    def mirror(self, root):
        """
        :type root: TreeNode
        :rtype: void
        """
        if (root == None): return
        root.left, root.right = root.right, root.left
        # x = root.left
        # root.left = root.right
        # root.right = x
        self.mirror(root.left)
        self.mirror(root.right)




